Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill by Operating Segment

Goodwill — Goodwill by operating segment as of December 31, 2018 and 2017 and changes for the years then ended are as follows (in thousands):

	Contract		Pressure			Directional			Other
	Drilling		Pumping			Drilling			Operations		Total
Balance December 31, 2016	$	86,234	$	—		$	—		$	—	$	86,234
Goodwill acquired		308,826		121,444			88,685			6,284		525,239
Balance December 31, 2017		395,060		121,444			88,685			6,284		611,473
Goodwill acquired		—		—			—			9,412		9,412
Measurement period adjustment		—		—			1,000			—		1,000
Impairment		—		(121,444	)		(89,685	)		—		(211,129	)
Balance December 31, 2018	$	395,060	$	—		$	—		$	15,696	$	410,756

Summary of Segment and Weighted Average Useful Life of Intangible Assets

The following table identifies the segment and weighted average useful life of each of the Company’s intangible assets:

		Weighted Average
	Segment	Useful Life
		(in years)
Customer relationships	Directional drilling	3.00
Customer relationships	Other operations	7.00
Developed technology	Directional drilling	10.00
Favorable drilling contracts	Contract drilling	0.83
Internal use software	Directional drilling	5.00

Gross Carrying Amount and Accumulated Amortization of Intangible Assets

The gross carrying amount and accumulated amortization of intangible assets as of December 31, 2018 and 2017 are as follows (in thousands):

	2018							2017
	Gross Carrying		Accumulated			Net Carrying		Gross Carrying		Accumulated			Net Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Customer relationships	$	28,000	$	(10,719	)	$	17,281	$	26,200	$	(1,943	)	$	24,257
Developed technology		55,772		(6,533	)		49,239		48,000		(1,137	)		46,863
Favorable drilling contracts		22,500		(22,500	)		—		22,500		(18,482	)		4,018
Internal use software		482		(118	)		364		482		(21	)		461
	$	106,754	$	(39,870	)	$	66,884	$	97,182	$	(21,583	)	$	75,599

Remaining Amortization Expense Associated with Finite-Lived Intangible Assets

The remaining amortization expense associated with finite-lived intangible assets is expected to be as follows (in thousands):

Year ending December 31,
2019	$	14,664
2020		12,721
2021		5,931
2022		5,909
2023		5,834
Thereafter		21,825
Total	$	66,884